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JSON Formatter

Format, validate, and beautify JSON data right in your browser. Supports minification, syntax highlighting, and error detection with zero server calls.

json formatter validator developer-tools

Published March 21, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Paste or type JSON into the input area. The tool validates your JSON in real-time using the browser’s native JSON.parse() and displays formatted or minified output instantly.

Features

  • Format: Pretty-print JSON with configurable indentation (2 or 4 spaces)
  • Minify: Compact JSON to a single line for smaller payloads
  • Validate: Instant error detection with position information
  • Copy: One-click copy to clipboard

Use Cases

  • Debugging API responses — paste raw JSON and format for readability
  • Preparing JSON payloads — format for review, then minify for sending
  • Validating configuration files — catch syntax errors before deployment